WP1311 VoIP Analysis Kitchens

8/17/2019 WP1311 VoIP Analysis Kitchens

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SGN1 WP 1311

04/16/2007DRAFT ACP/WGN11/SG N1

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ICAO/AERONAUTICAL COMMUNICATIONS PANEL (ACP)

Sub-working group N1

WorkingInfor!"ion P!p#r

A Sur$#% of &oi'# o$#r In"#rn#" Pro"o'o (&oIP) Appi'!"ion&oi'#o$#r IP (&oIP) An!%i

!n* i" R!ifi'!"ion forAir Tr!ffi' M!n!g##n" (ATM) +#po%#n"

Prepared by: WGN/ Eric WeillSGN1Presented by: Kelly Kitchens

January 2007

1

SUMMARY

This working !"r "x!#in"s $%rr"n& 'o(P i#)"#"n&!&ion "**or&s in go+"rn#"n& !n,

in,%s&r&h" #!rk"&s. !n, wh!& #! " in*"rr", *ro# &h"s" $!s"s r"g!r,ing &h" *"!sii)i& o*

'o(P *or Gro%n,-Gro%n, G-G AT $o##%ni$!&ions


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10 In"ro*u'"ion

Th" &"rr"s&ri!) +oi$" $o##%ni$!&ions in,%s&r $on&in%"s &o h!s ""n %n,"rgoing !&"$hno)ogo)ogi$!) r"+o)%&ion !n, o+"r &h" !s& 20)!s& &wo "!rs &h"r". h!s ""n !wi&h &h"

s&"!, &r!nsi&ion o* &")"hon $o##%ni$!&ions )in"s *ro# Ti#" Di+ision %)&i)"x TD

P5 &o (P-!s", P5 !n, %)&i#!&") &o 'oi$" o+"r (n&"rn"& Pro&o$o)s

Th" #o&i+!&ion *or &his &"$hni$!) r"+o)%&ion w!s "x"$&", $os& s!+ings in "rsonn") !n,

in*r!s&r%$&%r" Th"s" s!+ings *o$%s", on r",%$&ion in s&!** r"%ir"#"n&s. n"&work $on+"rg"n$" !n, si#)i*i$!&ion. whi$h is &h" $o#ining o* +oi$" !n, ,!&! s"r+i$" o+"r !

sing)" n"&work in*r!s&r%$&%r". ! ,"$r"!s" in ss&"# $os&s no ,",i$!&", rori"&!r &")"hon"

"%i#"n&. !n, "!si"r r"$on*ig%r!&ions STP !s", n"&work #!n!g"#"n& This !"r

wi)) !n!)" ,is$%ss +!rio%s !s"$&s in+o)+", in'o(P &"$hno)og *or s%i&!i)i& *or %s" in !ir &r!**i$ $o##%ni$!&ions #!ni*"s&ing &his $h!ng"

,02 3!'kgroun*4 Mo"i$# for Swi"'5ing "o &oIP

Th" s&!r& o* &")"hon" s"r+i$" !n, ,!&! n"&work s"r+i$"s w"r" in,""n,"n& ,"+")o#"n&s.

whi$h h!+" #"rg", "$!%s" o* &h" ,igi&i!&ion o* &h" !n!)og +oi$" sign!) D!&!$o##%ni$!&ions w!s ini&i!)) ! s"r+i$" &h!& $onsis&", o* ! )ow s"", $onn"$&ion +i! !

&")"hon" )in" +i! (n&"rn"& S"r+i$" Pro+i,"r (SP

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xx/01/07T")"hon" s"r+i$"s !r" !s", on !n !rr! o* &"$hno)ogi"s Th" r!ng" *ro# !n!)og $ir$%i&

swi&$h", &o ,igi&!) $ir$%i& swi&$h", !n, *i"r o&i$ &"$hno)ogi"s. whi$h is r"*"rr", &o !s &h"

%)i$ swi&$h", &")"hon" n"&work PSTN Th"s" &"$hno)ogi"s !r" #!xi#i", *or +oi$"

s"r+i$"s !n, !r" "x"nsi+" &o %r$h!s". $o#)i$!&", &o i#)"#"n&. !n, rori"&!rTh"r"*or" $os&) *or +!)%" !,,", s"r+i$"s )ik" +i,"o !n, ro!,!n, ,!&! (n !,,i&ion. &h"

s%i&" o* ro&o$o)s n"$"ss!r &o i#)"#"n& &h" +!rio%s s"r+i$"s gr"w $%#"rso#" !n,

so#"&i#"s $r"!&", $on*)i$&s wi&hin &h" &")"hon" n"&work

8!rg"-s$!)" ,")o#"n& o* ,igi&!) !$k"& ,!&! s"r+i$" w!s ini&i!)) i#)"#"n&", %sing 529

ro&o$o)s :ow"+"r. &h" )ow !n,wi,&h $!!i)i& !n, &h" ,"sign *o%n,!&ion *or %s" o* 529o+"r 64k s DS0 &")"$o##%ni$!&ion )inks #!," &his &"$hno)og in"**i$i"n& *or high-s"",

,!&! This r"s%)&", in &h" #igr!&ion &ow!r,s TCP/(P ro&o$o)s !n, s"r+i$"s

Th" ,"+")o#"n&s in ,igi&!) +oi$". &h" n"", *or high"r !n,wi,&h ,!&! s"r+i$"s $o%)", wi&h

&h" ,"sir" &o si#)i* n"&work &oo)og !n, ,"$r"!s" &h" $os&s o* $o##%ni$!&ions )", &o &h""x"ri#"n&!&ion o* ,igi&!) +oi$" sign!)s o+"r ,!&! n"&works Th"s" "x"ri#"n&s "+"n&%!))

#o+", in&o &h" $o##"r$i!) wor), !))owing $o#!ni"s !n, n"&work %s"rs &o %s" &h" (n&"rn"&!s ! $o##%ni$!&ions in*r!s&r%$&%r" *or +oi$" $o##%ni$!&ions :ow"+"r. ,%ring &h" in*!n$

o* 'o(P ,")o#"n& n"&work !+!i)!i)i& !n, ;oS w"r" iss%"s Th" r"so)%&ion o* *or &h"s"

ro)"#s o* high"r )"+")s o* r")i!i)i&. !+!i)!i)i&. !n, %!)i& o* s"r+i$" w"r" &o ,")o ri+!&" in&"rn"&s &o "ns%r" )"+")s o* s"r+i$" si#i)!r &o &o)) %!)i& +oi$" $!))s on !

$on+"n&ion!) &")"$o##%ni$!&ions n"&work

Th" ini&i!) %s" o* !$k"&i", +oi$" w!s !s ! "s& "**or& s"r+i$" o+"r &h" (n&"rn"& :ow"+"r.

on$" +"n,ors !n, $o#!ni"s r")i", &h" "n"*i& o* %sing ,!&! n"&works &o !+oi, )ong ,is&!n$"

&o)) $h!rg"s !n, &!rri**s !n in,%s&r "#"rg", &h!& ,"+")o", !,,i&on!) ,!&! n"&working ro&o$o)s !n, "%i#"n& &o "n!)" 'o(P ss&"# in&"ro"r!&ion wi&h &h" PSTN ss&"#

A,,i&ion!)). ! n"w &" o* $o##%ni$!&ions s"r+i$" ro+i,"r w!s "#"rging &h!& %i)& &h"

n"&work in*r!s&r%$&%r" !s", on 'o(P &"$hno)og ins&"!, o* $ir$%i& swi&$h", &"$hno)ogAs is

%s%!)) &h" $!s" in &h" $o##"r$i!) s"$&or. "x"$&", $os& s!+ings g"n"r!)) ,ri+"sin*r!s&r%$&%r" $h!ng"s (n &h" +oi$" $o##%ni$!&ions in,%s&r. &his h!s r"s%)&", in &h"

#igr!&ion &o (P-!s", &"$hno)ogi"s. wi&h 'o(P now o%&s"))ing ,igi&!) P5 )in"s

Pri#!r *!$&ors r"!)iing s%$h s!+ings *ro# &h" #igr!&ion &ow!r,s 'o(P in$)%,"<

• =%,i$io%s s")"$&ion o* ro,%$& o**"rings. in$)%,ing &r!,"-o** s&%,i"s "&w""n !,o&ing

! &o&!) sing)" +"n,or &%rnk" *r!#"work. "s&-o*-r"", s")"$&ion o* $o#on"n&s

!#ong +"n,or o**"rings. or o"n-so%r$" ")"#"n&s wi&hin &h" ss&"#• Ro%s& )!nning in !,+!n$" o* "%i#"n& ,")o#"n& !n, ins&!))!&ion

• (n+"s"n& in #!n!g"#"n& &oo)s &o #oni&or !n, $on&ro) n"&work o"r!&ion!)

!r!#"&"rs

• S%**i$i"n& s&!**ing %n,"rgoing ! ,is$i)in", &r!ining !ro!$h &o "ns%r" ro"r !n,

"**i$i"n& n"&work o"r!&ions So#" o* &his %r,"n #! " !))"+i!&", wi&h o%&so%r$ing.

"s"$i!)) *or s#!))-&o-#",i%# si" n"&works &h!& ,o no& r"%ir" *%)) &i#" s&!**ing

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xx/01/07Th" r"s%)& o* s%$h #"!s%r"s is ! r",%$&ion in s&!** ro*i)ing. sin$" 'o(P ,")o#"n&s !n,

r"$on*ig%r!&ions !r" "!si"r &o i#)"#"n& in &h" *i"), !%&o#!&ion &h!n TD T")"$o#

$ir$%i& !n, $!)ing $os&s !r" r",%$", ,%" &o #or" "**i$i"n& %&i)i!&ion o* #",i!

6 An!%i

'oi$" o+"r (n&"rn"& Pro&o$o). !)so $!))", 'o(P. (P T")"hon. (n&"rn"& &")"hon. !n, 'oi$"o+"r ro!,!n, is &h" ro%&ing o* +oi$" $on+"rs!&ions o+"r &h" %)i$ (n&"rn"& or &hro%gh !

ri+!&" (P-!s", n"&work ri+!&" in&"rn"& Th" Pro&o$o)s %s", &o $!rr +oi$" sign!)s o+"r

&h" (P n"&work !r" $o##on) r"*"rr", &o !s 'oi$" o+"r (P or 'o(P ro&o$o)s A ,"&!i)",

!n!)sis o* ri#!r 'o(P &"$hno)ogi"s !r" $on&!in", in Th" 'oi$" o+"r (P :!n,ook *or Air Tr!**i$ !n!g"#"n& A)i$!&ions

'oi$" o+"r (P is no )ong"r ! hoi"s& or ig %sin"ss s"r+i$" os& &")"hon". $!)" T'. !n,s!&"))i&" T' s"r+i$" ro+i,"rs !r" #igr!&ing !n, o**"ring &o &h"ir s%s$ri"rs +oi$" o+"r (P

&")"hon &"$hno)og This is ,%" &o n"&work $on+"rg"n$". ro+"n &"$hno)og. !n, $os&s!+ings Th" *o))owing !n!)sis wi)) *o$%s on &hr"" ,i**"r"n& !s"$&s o* +oi$" o+"r (Ps"r+i$"s. whi$h !r" %sin"ss. &"$hni$!). !n, o"r!&ion!)

7.1 Business Aspect

(n &h" !s& *"w "!rs &h" 'o(P )!n,s$!" h!s $h!ng", Th" &")"$o##ni$!&ions in,%s&r is

#o+ing !w! *ro# $ir$%i&-!s", +oi$" so)%&ions Th" R!,i$!&i Gro% ! &")"$o##%ni$!&ions

#!rk"& r"s"!r$h *ir# r",i$&s &h!& 74 "r$"n& o* !)) $oror!&" &")hon )in"s wi)) " (P-!s", 200>1 (n !,,i&ion. "n, o* )i*" !n, "n, o* s%or& no&i$"s *or &i#"-,i+ision #%)&i)"xing

TD ri+!&" r!n$h "x$h!ng"s P5s !n, s!r" !r&s !+!i)!i)i& !r" ro#&ing

$o#!ni"s &o r"-"+!)%!&" &h"ir +oi$" ss&"#s

Th" r!i, !$$"&!n$" o* 'o(P s&!n,!r,s !n, !)i$!&ions !r" #!king ss&"# ins&!))!&ions

#%$h "!si"r &h!n &r!,i&ion!) +oi$" ss&"#s (n*orn"$&i$s. !n in&"rn!&ion!) #!rk"& r"s"!r$h

*ir# ro?"$&s &h!& wor),wi," r"+"n%" *ro# (P-$!!)" P5 "%i#"n& wi)) r"!$h 102 in200@. % *ro# 36 in 20032

A N"#"r&"s R"s"!r$h S%r+"3 o* >0 (T "x"$%&i+"s r"or&s &h!& o+"r &i#" &h"r" wi)) "signi*i$!n& $os& s!+ings (n or,"r &o ,"&"r#in" $os& "n"*i&s o* ,")oing 'o(P h!r, $os&s )ik"

h!r,w!r". so*&w!r". h"!, $o%n&. !n, "x"ns"s n"", &o " $onsi,"r", Ano&h"r i,"n&i*i", $os&

!r" so*&$os&s. whi$h $onsis&s o* $o##on) "r*or#", &!sks )ik" #o+"s. !,,s. or $h!ng"s

os& $o#!ni"s r"s"!r$h", g"n"r!)) $!&igori", s!+ings in &o &h" *o))owing !r"!s<

• Pro?"$& !n!g"#"n&

• A,#inis&r!&ion

1 Th" R!,i$!&i Gro%. (P T")"hon &o !k" BP 74 o* A)) Coror!&" T")"hon in 200> D"$"#"r 2120092 (n*on"&i$s R"s"!r$h. En&"rris" T")"hon !rk"& Sh!r" 3;09No+"#"r 2@. 20093 N"&work Wor), Th" %sin"ss C!s" *or 'o(P! 19 2006

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• S&!**ing

• E%i#"n& :W/SW

• Cos& A+oi,!n$"

• Pro,%$&i+i& G!ins

Th" !#on& o* s!+ings or !+oi,!n$" wi)) " ,"&"r#in", &h" si" o* &h" o"r!&ion. r"%ir",$!))ing !r"!. !n, wh"r" &h" $o#!n is in &h"ir $!i&!) "%i#"n& ,"r"$i!&ion )i*"$$)" A

$o#!n &h!& r"$"n&) %r$h!s", &")"$o##%ni$!&ions "%i#"n& #! h!+" ! h!r,"r &i#"

?%&i*iing $h!nging TD "%i#"n& *or 'o(P "%i#"n& "&. &h" s!#" $o#!n #! "!)" &o !$hi"+" signi*i$!n& s!+ings in s&!**ing !n, $os& !+oi,!n$" &o ?%s&i* #igr!&ing TD

+oi$" &r!**i$ &o 'o(P s"r+i$"s Th" "+"n&%!) ,ri+"r wi)) " &h!& &h" TD "%i#"n& wi)) no

)ong"r " !+!i)!)" Th"r"*or". i& #! " in &h" "s& in&"r"s& o* &h" $o#!n &o "s&!)ish ! o)i$ &o )i#i& TD "%i#"n& %r$h!s" &o!s r"%ir", &o s%s&!in o"r!&ion !n, #!k" !))

*%&%r" %r$h!s"s 'o(P

Ano&h"r %sin"ss $onsi,"r!&ion !r" "#"rging s"r+i$"s. *"!&%r"s &h!& w"r" on$" s%)"#"n&!)

$!n " ro+i,", !& no !,,i&ion!) $os& !n, in so#" $!s"s !r" no& !+!i)!)" %n)"ss o% ,")o'o(P s"r+i$"s So#" o* &h" s"r+i$"s !r" "nh!n$", #oi)i& %sing n%#"r or&!i)i&. %ni*i",

#"ss!ging. !n, !,+!n$", $!)) ro%&ing Th"s" *"!&%r"s "nh!n$" ro,%$&i+i& !n, "n!)"

!$$"ss whi)" s#)i*iing n"&work in*r!s&r%$&%r"4

7.2 Technical Aspect

Th" &"$hno)og "hin, 'o(P is no& n"w. i& w!s *irs& i#)"#"n&", in 1>73 !& &h" Bni+"rsi& o* So%&h"rn C!)i*orni! r"s"!r$h"r D!nn Coh"n Th" go!) o* &h" ro?"$& w!s &o ,"+")o !n,

,"#ons&r!&" &h" *"!sii)i& o* s"$%r". high-%!)i&. )ow-!n,wi,&h. r"!)&i#". *%))-,%)"x,igi&!) +oi$" $o##%ni$!&ion o+"r ! !$k"& swi&$h", $o#%&"r n"&work This *irs& &"s& w!s

%s", &o s"n, s""$h "&w""n ,is&ri%&", si&"s on &h" ARPANET %sing s"+"r!) ,i**"r"n& +oi$"-"n$o,ing &"$hni%"s Coo"r!&ing r"s"!r$h $o#!ni"s in$)%,", (S(. 8in$o)n 8!or!&or.

C%))"r-:!rrison. &h" S""$h Co##%ni$!&ions R"s"!r$h 8!or!&or. !n, o)&. "r!n"k !n,

N"w#!n

Th" ro&o$o) $onsis&", o* &wo ,is&in$& !r&s< $on&ro) ro&o$o)s !n, ! ,!&! &r!nsor& ro&o$o)

Con&ro) ro&o$o)s in$)%,", r")!&i+") r%,i#"n&!r &")"hon *"!&%r"s s%$h !s in,i$!&ingwho w!n&s &o &!)k &o who#H ring &on"sH n"go&i!&ion o* +oi$" "n$o,ingsH !n, $!)) &"r#in!&ion

D!&! #"ss!g"s $on&!in", +o$o,", s""$h For "!$h +o$o,ing s$h"#" ! *r!#" w!s ,"*in",

!s ! !$k"& $on&!ining &h" n"go&i!&", &r!ns#ission in&"r+!) o* ! n%#"r o* ,igi&i", +oi$"s!#)"s

7.2.1 Ease ! "#ple#entatin and Enhanced $eatures

T!sks &h!& #! " #or" ,i**i$%)& &o !$hi"+" %sing &r!,i&ion!) n"&works !r" "!si) i#)"#"n&",

%sing 'o(P For "x!#)". in$o#ing hon" $!))s $!n " !%&o#!&i$!)) ro%&", &o o%r 'o(P

4 T!king Ch!rg" o* o%r 'o(P N"&work. ="**"r W!)k"r. T :i$ks. F"r%!r 2004

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xx/01/07 hon". r"g!r,)"ss o* wh"r" o% !r" $onn"$&", &o &h" n"&work (* o% &!k" o%r 'o(P hon"

wi&h o% on ! &ri !n, o% $onn"$& &o &h" (n&"rn"&. o% $!n r"$"i+" in$o#ing $!))s r"g!r,)"ss

o* &h" )o$!&ion

!n 'o(P !$k!g"s in$)%," PSTN *"!&%r"s &h!& #os& &")$os &")"$o##%ni$!&ion $o#!ni"s

nor#!)) $h!rg" "x&r! *or. or #! " %n!+!i)!)" *ro# o%r )o$!) &")$o. s%$h !s 3-w!

$!))ing. $!)) *orw!r,ing. !%&o#!&i$ r",i!). !n, $!))"r (D

7.2.2 %bility

Th" %s" o* 'o(P !))ows %s"rs &o &r!+") !nwh"r" in &h" wor), !n, s&i)) #!k" !n, r"$"i+" hon" )o$!) $!))s Sin$" &h" $!))s !r" i##",i!&") o**)o!,", !n, on)o!,", &o ! )o$!) in&"rn"&

s"r+i$" ro+i,"rs !& o&h &h" origin!&ion !n, ,"s&in!&ion oin&s. &h" s%s$ri"rs $!n !+oi,

)ong ,is&!n$" &o)) $h!rg"s

7.2.& "nte'rated Ser(ices

Bs" o* 'o(P hon"s $!n !ssis& in &h" in&"gr!&ion wi&h o&h"r s"r+i$"s !+!i)!)" o+"r &h"n"&work So#" o* &h" s"r+i$"s !+!i)!)" in$)%," +i,"o $on+"rs!&ion !n, #"ss!g" or ,!&! *i)"

"x$h!ng" Th"s" !,,i&on!) s"r+i$"s $!n " ,")i+"r", in !r!))") wi&h &h" $on+"rs!&ion or

!%,io $on*"r"n$"

7.2.) *ra+bac,s

'o(P &"$hno)og s&i)) h!s shor&$o#ings. %& #os& $!n " #i&ig!&", %sing +!rio%s n"&work

)!nning &"$hni%"s So#" o* &h" ,r!w!$ks !r" ,is$%ss", in &h" *o))owing !r!gr!hs

7241 F!x"sA ,r!w!$k &o 'o(P is &h" ,i**i$%)& in s"n,ing *!x"s ,%" &o so*&w!r" !n, n"&working

r"s&r!in&s in #os& ho#" ss&"#s :ow"+"r. !n "**or& is %n,"rw! &o r"#", &his ,"*ining

!n !)&"rn!&" (P-!s", so)%&ion *or ,")i+"ring F!x-o+"r-(P. %sing &h" T3@ ro&o$o) or

&r"!&ing &h" *!x ss&"# !s ! #"ss!g" swi&$hing ss&"# whi$h ,o"s no& n"", r"!) &i#" ,!&!&r!ns#ission Th" "n, ss&"# $!n $o#)"&") %**"r &h" in$o#ing *!x ,!&! "*or" ,is)!ing

or rin&ing &h" *!x i#!g"

7242 (n&"rn"& Conn"$&ion

Ano&h"r ,r!w!$k o* 'o(P s"r+i$" is i&s r")i!n$" on o&h"r s"!r!&" s"r+i$"s )ik" ! $onn"$&ion

*ro# !n (n&"rn"& S"r+i$" Pro+i,"r (SP Th" %!)i& !n, o+"r!)) r")i!i)i& o* &h" hon"

$onn"$&ion r")i"s on &h" %!)i&. r")i!i)i&. !n, s"", o* &h" in&"rn"& $onn"$&ion i& is %singPro)"#s wi&h in&"rn"& $onn"$&ion or &h" (SPs $!n !**"$& &h" 'o(P $!)) (n !,,i&ion. high"r

o+"r!)) n"&work )!&"n$ $!n )"!, &o r",%$", $!)) %!)i& !n, $!%s" ro)"#s )ik" "$hoingThis $!n " !+oi,", h!+ing s"r+i$" )"+") !gr""#"n&s wi&h &h" (SP or %sing ri+!&"

in&"rn"&s

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D%" &o ow"r "ing s%)i", +!rio%s ow"r $o#!ni"s. 'o(P wi)) no& !))ow $!))s ,%ring

ow"r o%&!g" This is "$!%s" %n)ik" &r!,i&ion hon" )in"s ow"r is no& in&"gr!&", in&o &h"

'o(P n"&work This ro)"# $!n " r"#",i", wi&h ! !&&"r !$k% ss&"#s Ano&h"r!ro!$h is &o *orw!r, $!))s &o ! $")) hon" or !)&"rn!&" n%#"r ,%ring ! ow"r o%&!g"

7244 (#)"#"n&!&ion

D%" &o &h" *!$& &h!& Bs"r D!&! Gr!# Pro&o$o) BDP ,o"s no& ro+i," ! #"$h!nis# &o "ns%r"

&h!& !$k"&s !r" ,")i+"r", in s"%"n&i!) or,"r. or ro+i," %!)i& o* s"r+i$" ;oS g%!r!n&""s.

'o(P i#)"#"n&!&ions $!n h!+" ro)"#s wi&h )!&"n$ !n, ?i&&"r This ro)"# is #or" &r%"wh"n g"os&!&ion!r s!&"))i&" $ir$%i&s !r" in+o)+",. whi$h h!+" )ong ro%n, &ri ro!g!&ion

,")! 400 #i))is"$on,s &o 600 #i))is"$on,s Th" r"$"i+ing no," #%s& r"s&r%$&%r" (P !$k"&s

&h!& #! " o%& o* or,"r. ,")!", or #issing. whi)" "ns%ring &h!& &h" !%,io s&r"!# #!in&!ins! ro"r &i#" $onsis&"n$ This ro)"# is nor#!)) so)+", %sing ! ?i&&"r %**"r

Whi)" &h"r" !r" iss%"s wi&h 'o(P s"r+i$"s. #os& $!n " o+"r$o#" %sing ro"r n"&work "ngin""ring &"$hni%"s. !,,i&ion!) ro&o$o)s. or "nh!n$", "%i#"n&

7.3 Operational Aspect

D%" &o &h" ,"$r"!s" in "%i#"n& $os&s. n"&work $on+"rg"n$". in&"gr!&", s"r+i$"s. !n,

$o#"&i&ion in &h" &")"$o##%ni$!&ions "+iron#"n& #os& &r!,i&ion!) &")$os !r" &r!ns&ioning &o

'o(P s"r+i$"s (n !,,i&ion. &h"r" !r" non&r!,i&ion!) s"r+i$" ro+i,"s )ik" $!)" &")"+ision !n,s!&"))i&" &")"+ision $o#!ni"s !s w")) !s (SPs $o#"&ing &o ro+i," &")"hon" s"r+i$"s

A #!?or ,"+")o#"n&. whi$h s&!r&", in 2004. h!s ""n &h" in&ro,%$&ion o* #!ss-#!rk"& 'o(P

s"r+i$"s o+"r ro!,!n, (n&"rn"& !$$"ss s"r+i$"s This !))ows s%s$ri"rs &o #!k" !n,r"$"i+" $!))s !s &h" wo%), o+"r &h" PSTN F%)) s"r+i$" 'o(P hon" $o#!ni"s ro+i,"

ino%n, !n, o%&o%n, $!))ing s"r+i$"s os& o**"r %n)i#i&", $!))ing &hro%gho%& &h" BS !n,

o*&"n &o C!n!,! or s")"$&", $o%n&ri"s in E%ro" or Asi! *or ! *)!& #on&h) *""H )"ss &h!n&r!,i&ion!) PSTN s"r+i$"s

A$$or,ing &o ! s&%, T")"hi!. &h" &o &"n ro+i,"rs in &h" Bni&", S&!&"s in$)%," 'on!g".'"rion 'oi$"Wing. ATJT C!))'!n&!g". S%nRo$k"&. 8ingo. N"&K"ro. ro!,'oi$". A#"ri$!

In)in". P!$k"&@. !n, E!r&h)ink '"rion 'oi$"Wing !n, ATJT C!))'!n&!g" !r" o&h )is&", in

s"$on, )!$" wi&h 99 #!rk"& sh!r"9 Th" signi*i$!n$" o* &his r"or& is &h!& '"rion !n,

ATJT !r" #!?or ro+i,"rs o* &r!,i&ion!) hon" s"r+i$"s I&h"r ro+i,"rs o* 'o(P s"r+i$" !r"

$o#!ni"s )ik" Sk" !n, N"&2hon" &h!& in so#" $!s"s !,+"r&is" *r"" &")"hon" $!))s o+"r &h" (n&"rn"&

9h&&LF(NA8L7L20L06,* 'o(P

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T")"$o##%ni$!&ions s"r+i$" ro+i,"rs ro%&in") %s" (P &")"hon o+"r ! ,",i$!&", (P

n"&works &o $onn"$& swi&$hing s&!&ions (n !,,i&ion &h" !r" %sing 'o(P s"r+i$"s &o !ggr"g!&"

)ong ,is&!n$" &!**i$ o+"r ,!&! n"&works

Coror!&ions h!+" ""n %sing (P &")"hon "x$)%si+") &o &!k" !,+!n&!g" o* n"&work

$on+"rg"n$" !n, &o)) !+oi,!n$" !n, i#ro+" +!)%" !,,", s"r+i$"s &o s%s$ri"rs (n&")Coror!&ion r"$"n&) $on,%$&", ! i)o& &o ,"&"r#in" &h" "n"*i&s o* 'o(P6 This i)o&

$on$)%,", !n, show", s!+ings in &h" *o))owing !r"!s

:!r,w!r" S!+ings 99A,,/o+" Ch!ng"s 92

D!&! C"n&"r S!+ings 67

(n !,,i&on. g!ins w"r" !)so o$$%rr", in &h"s" !r"!s<

Signi*i$!n& S!+ings *or S"r+i$"s !%,io $on*"r"n$ingSigni*i$!n& ,"$r"!s" in Wiring Ch!rg"s

D"$r"!s" in on&h) Bs!g" Ch!rg"s

(#ro+", Pro,%$&i+i&

Th" (n&") $!s" is no& %ni%" si#i)!r s!+ings !r" r"or&", Cis$o. := :"in. !n, n%#"ro%s

o&h"r $o#!ni"s Whi)" s!+ings w!s &h" ini&i!) ,ri+"r. &h" s"$on,!r "n"*i&s o* i#ro+",

"**i$i"n$. ro,%$&i+i&. !n, "!s" o* %s" w"r" !)so s&r"ss", Fin!)). !)) $o#!ni"s r"or&",&h!& &h" s"r+i$"s w"r" &r!ns!r"n& !n, &h" "n, %s"rs no&i$", no ,i**"r"n$"

7.&.2 ransitin

Exis&ing &")"$o##%ni$!&ion ss&"# !r" s&i)) +i!))" %& wi)) "+"n&%!)) " r")!$", wi&h !

n"w !n, i#ro+", ss&"# Th" )"g!$ &")"$o##%ni$!&ions ss&"# sho%), $oo"xis& wi&h &h"

"#"rging &")"$o##%ni$!&ion ss&"# A ossi)" !ro!$h is shown in A"n,ix 1

7.4 Recommendation

Co##%ni$!&ion ss&"#s !r" $%rr"n&) %n,"rgoing &r!nsi&ion &o 'o(P :ow"+"r. i* no&#!n!g", $orr"$&). i#)"#"n&!&ion &o s%or& $%rr"n& n"",s #! no& s%or& *%&%r"

r"%ir"#"n&s or ss&"#s

Th" $%rr"n& r"%ir"#"n&s in $o##"r$i!) +oi$" $o##%ni$!&ions ,o"s no& signi*i$!n&) ,i**"r

*ro# &h" r"%ir"#"n&s *or !+i!&ion +oi$" $o##%ni$!&ions Th"r"*or". i& is r"$o##"n,", &h!&

(CAI #o,i* SARPs !n, ,"+")o ! T"$hni$!) !n%!) !n, G%i,!n$" #!&"ri!) &o s%or&

'o(P s"r+i$"s in &h" ATN "*or" &h" $%rr"n& +oi$" $o##%ni$!&ions ss&"#s "$o#" oso)"&"!n, !r" no )ong"r s%or&", "%i#"n& +"n,ors

6 Th" %sin"ss C!s" *or En&"rris" 'o(P. S S!$k"r. S!n&!i&i. C S"n$". F"r%!r 2006

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02 Possible VoIP Transition ApproachInitiatives in Industry

For &h" *o))owing ,is$%ssion. &h" !r$hi&"$&%r" shown in Fig%r" 1 wi)) " %s", !s ! r"*"r"n$"

Figure 1. Transitioning Voice Communications Architecture from TDM to VoIP

3.1 Hybrid Systems

Ar%& &r!nsi&ioning o* )"g!$ TD-!s", +oi$" n"&works &o 'o(P &"$hno)og $!%s"s n%#"ro%s

ro)"#s. in$)%,ing<

• I"r!&ion!) ,isr%&ions ,%" &o )!$k o* *!#i)i!ri& wi&h n"w "%i#"n&. $!!i)i&i"s. !n,

ro$",%r"s

• 8oss o* R"&%rn In N"& Ass"&s in+"s&", in )"g!$ "%i#"n& &h!& h!s no& ""n *%))

,"r"$i!&",

• E%i#"n& !+!i)!i)i&

To #i&ig!&" s%$h iss%"s. in&"ri# ss&"# s&!&"s h!+" ""n ,")o", wh"r"in $on+"rsions o* &h"

in*r!s&r%$&%r" !r" "r*or#", in s&!g"s E!r)i"r s&!g"s o* &his ro$"ss g"n"r!)) &r!nsi&ion &h" inn"r

$or" *irs& &o #ini#i" o"r!&ion!) i#!$& on "n, ss&"#s For AT !)i$!&ions. &his wo%), !**"$&&h" n"&work $or" i". &h" PSTN $)o%, in Fig%r" 1. wi&ho%& $h!nging &h" $o##%ni$!&ion ss&"#s !&

AT *!$i)i&i"s

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xx/01/07An ini&i!) s&!g" o* ! hri, ss&"# $o%), in&"r*!$" !n (P-!s", $or" &o &h" )"g!$ "n, ss&"#s

&hro%gh !n A,!&"r. !s shown in Fig%r" 1. whi$h *"!&%r"s ! 'o(P g!&"w! This )"+") o* &r!nsi&ion

#! " s%**i$i"n& *or &h" %s"r n"",s. or #! in$%r $os&s &o &h" )i#i& o* &h" %,g"& $ons&r!in&s

(* &h"r" !r" r"so%r$"s !))o$!&", *or *%r&h"r grow&h. )!&&"r s&!g"s o* ,")o#"n& wo%), grow &h" (P&"$hno)og o%&w!r,. s&!r&ing wi&h !,#inis&r!&i+". !n, "+"n&%!)) in&o &h" o"r!&ion!). ,o#!ins Th"

!$" o* &his &r!nsi&ion #! " go+"rn", <

• Cos& o* (P-"n!)", %s"r s"&s

• Cos& !n, s$h",%)" &o r")!$" )"g!$ wiring wi&h n"&work-s%i&!)" $!)ing

• Tr!ining o* o"r!&ion!) !n, #!in&"n!n$" "rsonn")

3.2 A Protocol Approach to Hybridization T!M over IP"

In" no+") !ro!$h &o &r!nsi&ioning &h" n"&work *ro# &h" insi," o%&w!r, in+o)+"s &h" %s" o* &h"

TDo(P" ro&o$o). !&"n&", RAD D!&! Co##%ni$!&ions. whi$h !))ows TD-!s", "n,

ss&"#s &o in&"r*!$" wi&h !$k"& swi&$h", n"&works PSN This is !$hi"+", in &wo s&"s<

• TD &r!**i$ is !,!&", &o $!&%r" i&s sign!)ing !n, &i#ing in*or#!&ion *or r"s&or!&ion !& i&s

,"s&in!&ion This is !$hi"+", s"g#"n&ing &h" sn$hrono%s i& s&r"!# "$h!nis#s !)so

ro+i," r"$o+"r $!!i)i&i"s in $!s" o* r"!son!)" )"+")s o* !$k"& )oss

• This !,!&", &r!**i$ is &h"n "n$!s%)!&", in&o &h" *or#!& r"s$ri", &h" $or" PSN

!,,ing !rori!&" h"!,"rs &o &h" s"g#"n&s &o *or# !$k"&s Th"s" !$k"&s !r" &h"n ro%&",

o+"r &h" PSN &o &h"ir ,"s&in!&ions

A& &h" ,"s&in!&ion. &h" !$k"&s !r" s&ri", o* &h"ir h"!,"rs. &h" *r!#"s !r" $on$!&"n!&",. !n, &h"

&i#ing is r"g"n"r!&", &o r"$ons&r%$& &h" origin!) i& s&r"!#

An "x!#)" o* ! TDo(P !r$hi&"$&%r" is shown in Fig%r" 2

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7.4.1 Figure 2. Example TDMoIP Architecture

Wi&h &his !ro!$h. TDo(P Cir$%i& E#%)!&ion $!n r%n s"%,owir"s o* T1 or T3 &r!**i$ o+"r (P.E&h"rn"&. or P8S

TDo(P is %n,"rgoing ! s&!n,!r,i!&ion ro$"ss in &h" (n&"rn"& Engin""ring T!sk For$" (ETF !s

(n&"rn"&-,r!*& TD o+"r (P. ,r!*&-i"&*-w"3-&,#oi-06&x&. %n,"r &h" Ps"%,o-Wir" E#%)!&ion E,g"-

&o-E,g" PWE3 working gro% (n !,,i&ion. TDo(P is in $on*or#!n$" wi&h (TB-T

r"$o##"n,!&ions !n, P8S/Fr!#" R")! A))i!n$" i#)"#"n&!&ion !gr""#"n&s *or TD &r!nsor&

o+"r P8S

3.3 #oin$ %ull Tilt Transitionin$ &nd'to'&nd (ith Multimedia Protocols

(n &h" !,+!n$", s&!g"s o* &r!nsi&ion. wh"n &h" 'o(P in*r!s&r%$&%r" is "x&"n,", !$ross &h" "n, ss&"#

!n, $or" +oi$" $o##%ni$!&ion ,o#!ins. &h" ro+ision o* s"r+i$"s !n, in&"r*!$ing wi&h )"g!$

n"&working #! " !$hi"+", wi&h #%)&i#",i! ro&o$o)s Th"s" #"$h!nis#s o**"r *)"xi)$on*ig%r!)" i#)"#"n&!&ions &h!& $!n #!n!g" #%)&i)" $!)) s&r"!#s. !n, h!+" ro+isions *or o&h"r

#o,"s o* $o##%ni$!&ion "g. +i,"o. *!x

An "!r) "n&r in&o &his !r"n! w!s &h" (TB-T :323 *!#i) o* ro&o$o)s. whi$h *"!&%r"s ! ro%s& !n,

rigoro%s !ro!$h &o #%)&i#",i! #!n!g"#"n& R"$"n&). &ho%gh. &h" in,%s&r h!s ""n #igr!&ing

&ow!r,s &h" s&r"!#)in", S"ssion (ni&i!&ion Pro&o$o) S(P. wh"r" signi*i$!n& grow&h in !)i$!&ion

,"+")o#"n& h!s r"s%)&", in ! ro!, r!ng" o* $!!i)i&i"s !n, ro,%$& o**"rings

An i#or&!n& ini&i!&i+" &h!& h!s s&!n,!r,i", s"r+i$"s in &h" &")"$o##%ni$!&ions in,%s&r is Co#%&"r

S%or&", T")"hon A)i$!&ions CSTA This s"r+"s &o !s&r!$& ! s"r+i$" )!"r *ro# i&s %n,"r)ing

$o##%ni$!&ions ro&o$o)s Th" CSTA #o,") in$)%,"s &h" *o))owing<

• 26 C!)) Con&ro) *"!&%r"s

• 6 C!)) Asso$i!&", *"!&%r"s

• 1> 8ogi$!) D"+i$" *"!&%r"s

• 23 Phsi$!) D"+i$" *"!&%r"s

• 9 C!!i)i& Ex$h!ng" *"!&%r"s

• 4 Sn!sho& *"!&%r"s

• 3 oni&or *"!&%r"s

• 17 'oi$" s"r+i$"s

• '!rio%s o&h"r s"r+i$"s "g. Ro%&ing. ",i! A&&!$h#"n&. !in&"n!n$". D!&! Co))"$&ion.

A$$o%n&ing

Th" !)i$!&ion o* CSTA &o S(P is ,"s$ri", in ECA T"$hni$!) R"or& TR/@7. whi$h ,"s$ri"s &h"

%s"r !g"n& CSTA %!CSTA. whi$h $!n ro+i," #%$h o* &h" CSTA *%n$&ion!)i& o+"r ! S(P s"ssion

Wi&h &h"s" &oo)s. !,+!n$", &r!nsi&ion s&!g" 'o(P !r$hi&"$&%r"s #! " ,"+")o",. ! s!#)" o* whi$h is

shown in Fig%r" 3 No&" &h!& &h" ",i! S"r+"rs !r" S(P-"n!)", &o #!n!g" #%)&i#",i! s"ssions. !n,

&h" ",i! G!&"w! ri,g"s "&w""n &h" S(P !n, PSTN ,o#!ins +i! &h" C8ASS 9 swi&$h

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3.4 Streamlinin$ the &nd System P)* S(itchin$ #oes So+t

8"g!$ P5 *%n$&ion!)i& is &i$!)) ho%s", in ,",i$!&", %)k h!r,w!r". swi&$hing )!rg" n%#"rs

o* h!r,-wir" hon" )in"s &o !$hi"+" &h" +!rio%s $!))ing *%n$&ions r"%ir", &h" AT *!$i)i& This is! $os&) !ro!$h &o i#)"#"n& !n, #!in&!in. !n, $h!ng"s in $on*ig%r!&ion !r" )!or-in&"nsi+"

C%rr"n& 'o(P &"$hno)og h!s ""n ")i#in!&ing &h" h!r,w!r" ,""n,"n$i"s o* +oi$" swi&$hing wi&h &h"

!,+"n& o* so*&w!r" (P P5 &"$hno)og This so*&w!r" is g"n"r!)) hos&", on s&!n,!r, ,"sk&o

$o#%&"r ss&"#s An "x!#)" o* s%$h !n o**"ring is &h" !+i!nCI 90. ! so*&w!r"-!s",

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P5. &h!& $!n work o+"r ! 8AN or WAN &o !$& !s !n !,+!n$", 'o(P hon" ss&"# Wi&h S(P!s &h" g)%" o* i&s !r$hi&"$&%r". $!!i)i&i"s !r" !s", %on &h" so*&w!r" #o,%)"s )%gg",

in &o &h" *r!#"work In" o* &h"s" #o,%)"s &h!& wo%), " o* in&"r"s& &o $ri&i$!) !)i$!&ions

s%$h !s AT is &h" C!s$!,ing S"r+"r !$k% o,%)". whi$h #!in&!ins sn$hroni!&ion wi&h

o"r!&ion!) s"r+"rs. k""ing i& r"!, &o &!k" o+"r in $!s" o* ri#!r *!i)%r" A G!&"w!o,%)" is !)so !+!i)!)" &h!& ro%&"s in&r!-"n&"rris" $!))s &hro%gh &h" n"!r"s&. #os& $os&-

"**"$&i+" r!n$h o**i$" g!&"w! !$ross &h" (n&"rn"&

Pro,%$&s o* &his i)k !r" "$o#ing &h" nor# in &h" 'o(P in,%s&r :ow"+"r. &h"r" is ! growing

$on&ro+"rsi!) &r"n, in &h" in,%s&r &o !,o& non-rori"&!r. or I"n So%r$" so*&w!r". *or

whi$h &h" so%r$" $o," is !+!i)!)" Th" ri#!r "x!#)" in &h" (P P5 ,o#!in is As&"riskThis so*&w!r" $!n r%n on ! PC o+"r +!rio%s *or#s o* BN(5 "g. 8in%x. !n, on !$ IS 5

This ro,%$& is ,own)o!,!)" *r"" o* $h!rg"

Sin$" s%$h so*&w!r" is so#"wh!& in &h" %)i$ ,o#!in. i& &"n,s &o " !$%ir", "$ono#i$!)).

!n, is o*&"n w")) &"s&", ,%" &o i&s &r!ns!r"n$ !$ross &h" ,"+")o#"n& !n, %s"r $o##%ni&i"sFor &hos" "n&"rris"s wi&ho%& &h" r"%isi&" so*&w!r" "x"r&is". so*&w!r" in&"gr!&ors !r"

!+!i)!)" *or ins&!))!&ion !n, #!in&"n!n$" (n *!$&. &his &r"n, h!s r"+"rs", &h" &i," in &h!&s"$i!) h!r,w!r" is o*&"n ro+ision", &o !$hi"+" o&i#!) "r*or#!n$" *ro# &his so*&w!r" For

&h" As&"risk so*&w!r". Digi%#O #!k"s &h" !sso$i!&", h!r,w!r" :ow"+"r. &his h!r,w!r"

$onsis&s o* in&"r*!$" $!r,s &h!& !r" !,?%n$&s &o "xis&ing s"r+"rs. no& wi&h &h" ig *oo&rin&.$oo)ing r"%ir"#"n&s. !n, "x"ns" o* ig iron P5s

3.5 Hello, VoIP, are you Available-

AT !)i$!&ions %& ! high r"#i%# on !+!i)!i)i& For )"g!$ "%i#"n&. &his w!s

#!ni*"s&", wi&h r",%n,!n$. !n, s"$i*i", wi&h ! %!n&i*i!)" !+!i)!i)i& "r$"n&!g" Thiswork", *or h!r,w!r"-in&"nsi+" so)%&ions. wh"r" n"&work !&hs w"r" h!r,-wir", !n, *!i)%r"

#o,"s w"r" ,is$r"&") o%n,",

This !r!,ig# "!rs r"-"+!)%!&ion in &h" 'o(P ,o#!in For "x!#)". (P is ! ro%&ing ro&o$o).so *!i)%r"s in ! n"&work !&h or )ink !r" !%&o#!&i$!)) r"ro%&", +ir&%" o* (P :ow"+"r.

'o(P ss&"#s !r" s%s$"&i)" &o #or" s%&)"&i"s !**"$&ing !+!i)!i)i&. s%$h !s<

• Th" *)"xi)" $on*ig%r!&ions o* so*&w!r" !n, &h"ir ,is&ri%&", !))o$!&ions &o h!r,w!r"

#!k" i& #or" ,i**i$%)& &o &r!$" *%n$&ion!) !n, "r*or#!n$" *!i)%r"s

• F!i)%r" #o,"s $!nno& si#) " ,"s$ri", !s on or o** S"r+i$" ,"gr!,!&ion "g.

nois". ,is&or&ion. ,")! s$"n!rios !r" !)so &o " $)!ssi*i", !s *!i)%r" si&%!&ions wh"ni#)"#"n&ing sh!r", #",i! n"&work so)%&ions s%$h !s 'o(P

• S"$%ri& )!s ! ro)" in s"r+i$" !+!i)!i)i& Sin$" 'o(P &r!**i$ sh!r"s #",i! wi&h ,!&!.

&h" !r" +%)n"r!)" &o &h" s!#" &hr"!&s

Th" in,%s&r h!s r"son,", wi&h +!rio%s 'o(P #!n!g"#"n& &oo)s &h!& !r" ro!$&i+" !n, %s"

*"",!$k )oos &o #oni&or +!rio%s *%n$&ion!) !n, "r*or#!n$" !r!#"&"rs &o r",i$&. !)"r&.

!n, so#"&i#"s r"+"n& !n, $orr"$& *or. i##in"n& *!i)%r"s !n, s"r+i$" !no#!)i"s Th"r" is

14


15/15


11/SG N1WP-xxxx

xx/01/07

"+"n ! &oo) &h!& $!n ro+i," $!))-)o$king s"r+i$"s i* high %&i)i!&ion is s"ns", on &h"n"&work S"$%ri& #!n!g"#"n& &oo)s !r" on &h" #!rk"& &o #oni&or !n, $on&ro) %s"r !n,

s"r+i$" !$$"ss &o 'o(P r"so%r$"s T"$hno)ogi"s h!+" ""n ,"+")o", *or #irroring so*&w!r"

!$ross #%)&i)" )!&*or#s in &h" ss&"#. #i&ig!&ing &h" i#!$& o* ! s"r+"r *!i)%r" %$h o*

&his work !n, o&h"r "**or&s &o #!in&!in high !+!i)!i)i& !r" "ing in+"s&ig!&", %n,"r &h" !"giso* &h" S"r+i$" A+!i)!i)i& For%#. ! $onsor&i%# o* *or& )"!,ing $o##%ni$!&ions !n,

$o#%&ing $o#!ni"s Th"ir go!) is &o ,"+")o high !+!i)!i)i& !n, #!n!g"#"n& so*&w!r"

in&"r*!$" s"$i*i$!&ions *or &h" in,%s&r

3.6 Public Service Initiatives

19

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